Amount of Root Resorption of Maxillary Anteriors After en Masse Versus Two Step Space Closure

The goal of this study is to compare the three dimensional root resorption after extraction space closure in two groups: two step retraction and en masse retraction. Th main aim of this study is to conclude which method is less damaging to the roots.Participants will be divided into two groups:En masse retraction (experimental)Two step retraction (control) Pre retraction and post retraction CBCT scans will be compared for both groups.

Inclusion Criteria:Patients who signed the informed consent to be part of this study.Patients with Class I or Class II malocclusion.Patients requiring extractions of maxillary first premolars with absolute anchorage.Good periodontal status.Exclusion Criteria:Patients who are syndromic or have cleft lip and/or palate.Patients with severe root dilacerations or root canal treated incisors.Patients receiving drugs that alter tooth movement.Patients with systemic disease like endocrinological disorders, vit D excess or deficiency, thyroid or parathyroid problems.Patients with history of trauma to dentition or impacted teeth in anterior maxilla.Patients who have undergone previous orthodontic treatment.